Rear bumper for an automobile



FIG. 1 is a front elevational view of a rear bumper for an automobile showing our new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a left side elevational thereof;

FIG. 6 is a top, front and right side perspective view thereof; and,

FIG. 7 is a bottom, front and left side perspective view thereof.

The rear view of the rear bumper forms no part of the claimed design. 

CLAIM The ornamental design for a rear bumper for an automobile, as shown and described. 